DLASET (3) Linux Manual Page

dlaset.f –

Synopsis

Functions/Subroutines

subroutine dlaset (UPLO, M, N, ALPHA, BETA, A, LDA)
DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Function/Subroutine Documentation

subroutine dlaset (characterUPLO, integerM, integerN, double precisionALPHA, double precisionBETA, double precision, dimension( lda, * )A, integerLDA)

DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Purpose:

 DLASET initializes an m-by-n matrix A to BETA on the diagonal and

 ALPHA on the offdiagonals.

 

Parameters:

UPLO

 UPLO is CHARACTER*1

 Specifies the part of the matrix A to be set.

 = ‘U’: Upper triangular part is set; the strictly lower

 triangular part of A is not changed.

 = ‘L’: Lower triangular part is set; the strictly upper

 triangular part of A is not changed.

 Otherwise: All of the matrix A is set.

M

 M is INTEGER

 The number of rows of the matrix A. M >= 0.

N

 N is INTEGER

 The number of columns of the matrix A. N >= 0.

ALPHA

 ALPHA is DOUBLE PRECISION

 The constant to which the offdiagonal elements are to be set.

BETA

 BETA is DOUBLE PRECISION

 The constant to which the diagonal elements are to be set.

A

 A is DOUBLE PRECISION array, dimension (LDA,N)

 On exit, the leading m-by-n submatrix of A is set as follows:

 if UPLO = ‘U’, A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n,

 if UPLO = ‘L’, A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n,

 otherwise, A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j,

 and, for all UPLO, A(i,i) = BETA, 1<=i<=min(m,n).

LDA

 LDA is INTEGER

 The leading dimension of the array A. LDA >= max(1,M).

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 111 of file dlaset.f.

Author

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